This is an optional Factory RC EB410 SIF Carbon Fiber Rear Shock Tower. The Factory RC EB410 SIF "Shocks in Front" Rear Shock Tower in Black Weave allows you to run the latest "shocks in front" setups on your EB410 and match up the rest of Factory RC color woven carbon fiber products. Equipped with the Factory RC "Leading Edge" design making it easier to seal, and less prone to delamination.